Tomakomai (苫小牧市, Tomakomai-shi?) is a city and port located in Iburi subprefecture, Hokkaido, Japan. Though its name implies a small, idyllic town, it is the largest city in the Iburi Subprefecture. As of February 29, 2012, it had an estimated population of 174,216, with 83,836 households and a population density of 310.27 persons per km². The total area is 561.49 km².